body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 1rem 0;
    text-align: center;
}

main {
    padding: 1rem;
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1, h2 {
    margin: 0.5rem 0;
}

.tips {
    margin-bottom: 2rem;
}

.tips ul {
    list-style-type: disc;
    padding-left: 1.5rem;
}

.images {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.images img {
    max-width: 30%;
    height: auto;
    margin-bottom: 1rem;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

footer {
    text-align: center;
    padding: 1rem 0;
    background-color: #4CAF50;
    color: white;
    position: fixed;
    width: 100%;
    bottom: 0;
}